To view the data or create a report, you must be within Bluetooth range of your device. Having another device (phone/tablet) connected to the unit will prevent you from connecting as only one device is permitted at a time. Otherwise you will not be able to connect to the App.
If you are within Bluetooth range and are unable to connect, then force quit the app and restart your phone. Proceed by connecting to the app. If this does not resolve the issue, force quit the app once more and press and hold firmly the round button located on the side of the Pro for 3 seconds. The unit will flash and beep. Then try connecting to the app.
How to Force quit:
1- Go to Settings and tap Apps.
2- Scroll down through the list of apps and find the ones you want to stop.
3- Tap it and then select “Force Stop.” This will stop the app during the current session, though it'll relaunch when you reboot your phone.
iPhone X or later, or an iPad with iOS 12 or later, or iPadOS
1- From the Home screen, swipe up from the bottom of the screen and pause slightly in the middle of the screen. ...
2- Swipe right or left to find the app that you want to close.
3- Swipe up on the app's preview to close the app.
iPhone 6, 7 and 8
1- Double-press the home button to bring up all open apps and swipe left or right to locate the app you want to close.
2- Swipe up on the app you want to close.
3- Press the home button to navigate to your home screen.